Abstract
A study has been made of the reaction whereby a blue adsorption complex is formed when an organic solvent solution of vitamin A is added to sodium bentonite. In addition to a physical adsorption of the vitamin on sodium bentonite a chemical alteration occurs in the vitamin A molecule which results in the formation of anhydro vitamin A. The adsorbed material may be removed from the sodium bentonite by extraction with diethyl ether but the blue color is dissipated and a secondary reaction product is formed. This latter compound exhibits the characteristics of triene conjugation and exhibits maximum absorption at about 290 mμ. Equations have been developed for the spectrophotometric analysis of the binary mixtures encountered in the reaction and satisfactory agreement has been obtained between calculated and observed values.
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